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(No VOdeM G. R. TYLER.

TELEPHONE ATTACHMENT.

Patented May 19, 1885.

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UNITED STATES PATENT Ori-ICEO GEORGE R. TYLER, OF PALMYRA, NEV YORK.

TELEPHONE ATTACHMENT.

SPECIFICATION forming part of Letters Patent No. 318,057, dated May 19,1885.

Application tiled December 30, 1884. (No model.)

To @ZZ whom it may concern:

Be it known that I, GEORGE It. TYLER, of Palmyra, in the county of WayneandnState of New York, have invented a certain new and usefulImprovement in Telephone Attachments; and I do hereby declare that thefollowing is a full, clear, and exact description of the same, referencebeing had to the accompanying drawings, in which- Figure lis aperspective view showing my improvement applied to a telephone. Fig. 2is a sectional view in line w x, showing the device on an enlargedscale. Fig. 3 is a sectional view in line y y of Fig. l.

My improvement relates to a mouth and ear tube applied to thetelephone-box for augmenting and increasing the sound, so thatconversation can be carried on in a whisper.

The invention consists in the particular construction and arrangement ofthe device whereby the tube can be adj usted over and removed from themouth of the telephone; also can be turned to stand at differentheights, and is also constructed with double walls with ventholestherein to allow passage o f the breath in talking, all as hereinafterdescribed.

In the drawings, A shows the ordinary telephone-box, having an openingin front and a diaphragm behind it, as usual.

My improvement is as follows:

B is a cross-bar which lits over the front of the box, and is securedthereto by hook-shaped clamps a a, which pass through the ends and catchbehind the edges of the front plate of the box. rIhe clamps aretightened by thumbnuts b b. The device can therefore be applied andremoved at pleasure. In the center of the cross-bar is a circularenlargement, c, through which is made a hole corresponding 1with thehole through the front plate of the G is a circular rim forming thebearing for the speaking tube or trumpet, and this rim is hinged at thetop, or at any other point, to the cross-bar, as shown at d, so that therim, with the speaking-trumpet attached, can be turned up or to one sideto be out of the way when the telephone is not in use. When thus turnedup, it can be held by a catch or any other suitable device. The rim isconstructed with two flanges, ff, leaving a groove between, in whichrests and turns the circular flange of thespeaking-trumpet, as willpresently be described.

D is the speaking trumpet or tube. It is a straight tube of conicalforni; but the base is cut at an obtuse angle to the length, so that asthe tube is turned in its bearing the outer end of the tube is made tostand at ditferent heights, as shown by the full and dotted lines inFig. 2. By this means the position can be adjusted to the height ofdifferent persons, or it can be adapted to fit in corners of rooms, orin other places where the tube could not stand in line with the box. Onthe base end of the tube is a circular flange, h, which fits looselybetween the iianges f f of the rim C, as before described, thus makingthe tube an attachment to the rim, and at the same time allowing thetube to turn axially, forgthe purpose 7o before described. The tube isconstructed with double walls k 7c, closed at the outer and inner ends,and leaving a dead-air space between, as shown in Fig. 2. Near the outerend of the outer walls are made vent-holes n n, and near the inner endsof the inner walls are made corresponding vent-holes, p p. This allows apassage from the interior of the tube through the inner vent-holes, thenthrough the dead-air space, and finally through the outer vent-holes tothe exterior air. The obj ect of this arrangement is to allow vent tothe breath in speaking into the tube. In speaking the mouth is placedclose to the outer end of the tube, so as practically to close the same,and conversation can then be carried on in a whisper, so that it cannotbe heard by outside parties. The tube serves to concentrate and confinethe vibrations and hold them to the diaphragm, so that a whisper can beheard as readily as the ordinary tones of voice where such an attachmentis not used. The double walls are essential to cut offexteriorvibrations; and to make them effective the vent-holes arenecessary, asidescribed. Otherwise there would be no chance forexpiration of the breath.

Having described my invention, what I claiiii as new, and desire tosecure by Letters Patent, is-

1. In a telephone, the combination, with the Ico box A, of the cross-barB, extending across the front of the box, .the rim C,hinged thereto, andthe tube D, fitted to: the rim to turn therein, the base end of the tubebeing beveled at an obtuse angle, so that when turned in the rim InWitness whereof I have hereunto signed its outer end will stand atVarying heights7 as my naine in the presence of twosubscriblng hereinshown'and described. Witnesses.

2. In a telephone, the tube D, constructed 5 with double Walls, leavinga dead-air space be- GEO. R. TYLER.

tween, with Vent-holes n u in the outer Walls near the outer end, andcorresponding vent- Vitnesses: holes, lo p, in the inner Walls near theinner P. A. COSTIOH, end7 as shown and described, and for the pur- R. F.OSGOOD.

1o pose specified.

